Dielectric Essay

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A dielectric material is a substance that is a poor conductor of electricity. If the flow of current between opposite electric charge poles is kept to a minimum while the electrostatic lines of flux are not impeded or interrupted, an electrostatic field can store energy. Most dielectric materials are solid. Examples include porcelain (ceramic), mica, glass, plastics, and the oxides of various metals. Some liquids and gases can serve as good dielectric materials. Dry air is an excellent dielectric, and is used in variable capacitors and some types of transmission lines. Distilled water is a fair dielectric. A vacuum is an exceptionally efficient dielectric. Many materials, including living organisms and most agricultural products, conduct electric currents to some degree, but are still classified as dielectrics. Dielectrics and dielectric properties are defined generally and dielectric measurement methods and equipment are described for various…show more content…
2007). Dielectric properties values for fresh chicken breast meat in the 10 to 1800-MHz frequency range at temperatures from 5°C to 65°C are shown in Figure 15. These curves show frequency dependence of the dielectric properties similar to those for tissues of fruits and vegetables. Probable potential for using dielectric properties to assess meat quality characteristics was indicated. Dielectric spectroscopy measurements were also taken on the albumen and yolk of fresh chicken eggs at weekly intervals during 5 weeks of storage (Guo et al. 2007b). Dielectric properties from 10–1800 MHz for the fresh eggs are shown in Figure 16, where the albumen has higher values for both the dielectric constant and loss factor than the yolk at any given frequency. Dielectric properties changed during the storage period, but they did not correlate well with traditional quality factors for the

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